vis·i·bil·i·ty /ˌvɪzəˈbɪləti/
  能見,可見性,能見度
  vis·i·bil·i·ty /ˌvɪzəˈbɪlətɪ/ 名詞
  可見度,視見度
  Vis·i·bil·i·ty n.  The quality or state of being visible.
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  visibility
       n 1: quality or fact or degree of being visible; perceptible by
            the eye or obvious to the eye; "low visibility caused by
            fog" [syn: visibleness] [ant: invisibility]
       2: degree of exposure to public notice; "that candidate does
          not have sufficient visibility to win an election"; "he
          prefers a low profile" [syn: profile]
       3: capability of providing a clear unobstructed view; "a
          windshield with good visibility"